auto subscribe mail dirs

install/debian/9/dovecot/conf.d/15-mailboxes.conf

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+## Mailbox definitions
+##
+
+
+# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
+namespace inbox {
+  mailbox Drafts {
+    special_use = \Drafts
+    auto = subscribe
+  }
+
+  mailbox Junk {
+    special_use = \Junk
+    auto = subscribe
+  }
+
+  mailbox Trash {
+    special_use = \Trash
+    auto = subscribe
+  }
+
+  mailbox Sent {
+    special_use = \Sent
+    auto = subscribe
+  }
+  mailbox "Sent Messages" {
+    special_use = \Sent
+  }
+}

install/rhel/7/dovecot/conf.d/15-mailboxes.conf

@@ -0,0 +1,29 @@
+## Mailbox definitions
+##
+
+
+# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
+namespace inbox {
+  mailbox Drafts {
+    special_use = \Drafts
+    auto = subscribe
+  }
+
+  mailbox Junk {
+    special_use = \Junk
+    auto = subscribe
+  }
+
+  mailbox Trash {
+    special_use = \Trash
+    auto = subscribe
+  }
+
+  mailbox Sent {
+    special_use = \Sent
+    auto = subscribe
+  }
+  mailbox "Sent Messages" {
+    special_use = \Sent
+  }
+}

install/ubuntu/18.04/dovecot/conf.d/15-mailboxes.conf

@@ -0,0 +1,29 @@
+## Mailbox definitions
+##
+
+
+# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
+namespace inbox {
+  mailbox Drafts {
+    special_use = \Drafts
+    auto = subscribe
+  }
+
+  mailbox Junk {
+    special_use = \Junk
+    auto = subscribe
+  }
+
+  mailbox Trash {
+    special_use = \Trash
+    auto = subscribe
+  }
+
+  mailbox Sent {
+    special_use = \Sent
+    auto = subscribe
+  }
+  mailbox "Sent Messages" {
+    special_use = \Sent
+  }
+}